CN104047780B - designing method of high supercharged engine intake port - Google Patents
designing method of high supercharged engine intake port Download PDFInfo
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- CN104047780B CN104047780B CN201410291368.8A CN201410291368A CN104047780B CN 104047780 B CN104047780 B CN 104047780B CN 201410291368 A CN201410291368 A CN 201410291368A CN 104047780 B CN104047780 B CN 104047780B
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Abstract
The invention relates to a high supercharged engine intake port and a designing method, and belongs to the technical field of intake systems of internal combustion engines. The high supercharged engine intake port is characterized by comprising an intake port tapered section, an intake port throat and an intake port diverging section. The ration of the section area A0 of the intake port throat to the area A2 of an intake port outlet ranges from 0.75-0.85; the ratio of the distance L1 between the intake port throat and the intake port outlet to the total length L of the intake port ranges from 0.4-0.6. The designing method has the innovated advantages that the problem that the circulating capacity of an intake port designed by an existing low-intake-pressure engine intake port designing method is insufficient is solved; the engine intake port which meets the requirements of high supercharged working conditions is designed, so that the circulating capacity of the high supercharged engine intake port is improved, the pressure in a cylinder after intake is increased, and air input is increased; accordingly, the high supercharged engine intake port and the designing method have a positive effect on optimizing combustion and improving the performance of a high supercharged engine.
Description
Technical field
The present invention is a kind of high blower engine air intake duct and method for designing, belongs to engine aspirating system technical field.
Background technology
Supercharging technology is as a kind of effective means of energy-saving and emission-reduction, due to its good portability, extensive
It is applied in all kinds of electromotors.And the continuous improvement of the development with high efficiency vortex supercharger and engine charge pressure ratio, enter
The degree more and more higher of gas supercharging.It is contemplated that, the electromotor of high pressure-charging even super high pressure-charging will be got in the near future
Come more.
Improving constantly of engine charge pressure makes the engine inlets designed by current low-pressure admission be difficult to
Preferably play its function, thus restricting the lifting of engine performance.Therefore engine inlets design also will be with pressure
Lifting improves.
Traditional engine inlets are all based on that admission pressure is high and be designed, the raising with supercharging technology and
Extensively apply, be difficult to preferably send out in the electromotor of high pressure-charging even super high pressure-charging based on the air intake duct of traditional method design
Wave effect.Accordingly, it would be desirable to high blower engine performance is met according to the macroscopic property design of new inlet air conditions and gas will
The air intake duct asked.
Content of the invention
For high pressure-charging even superhigh supercharged engine, fill to reach preferable air flue negotiability and increase air inlet
Amount, invents a kind of high blower engine air intake duct and method for designing.
The present invention for achieving the above object, adopts the following technical scheme that：
A kind of high blower engine inlet structure includes air intake duct converging transition, air intake duct aditus laryngis and air intake duct divergent segment；
The tapered and flaring of described air intake duct is three-dimensional contraction and expansion.Shape particular by air intake duct cross section becomes
Change and to realize the control to airway contraction and expansion；Described air intake duct gullet section amasss A0With air intake port sectional area A2It
Than between 0.75～0.85；Apart from L between described air intake duct aditus laryngis and outlet1With the ratio of air intake duct total length L 0.4～
Between 0.6.
The method for designing of above-mentioned high blower engine air intake duct it is characterised in that：Described high blower engine air inlet
The method for designing in road comprises the following steps：
1) inlet mouth condition is determined according to supercharger pressure ratio and engine operation condition, including temperature T1, pressure P1With
And speed c1, determine that air intake duct gullet section amasss A0With air intake port sectional area A2The step of ratio include：
1.1) determine gas stagnation parameter (with subscript according to gaseous state parameter (representing with subscript 1) at inlet mouth
0 expression).
Stagnation parameter computing formula：
Wherein T1、p1、c1Represent the temperature of gas, pressure and speed at inlet mouth respectively；cpLevel pressure ratio for air
Thermal capacitance, k is adiabatic exponent of air, RgGas constant for air；T0、p0、v0Respectively represent stagnation state when gas temperature,
Pressure and specific volume.
1.2) according to gas critical pressure ratio ν in air fluecrDetermine the critical parameters of gas (with subscript cr table with stagnation parameter
Show)；
Wherein：pcrRepresent pressure during gas critical state, vcrRepresent specific volume during gas critical state, ccrRepresent
Speed during gas critical state.
1.3) according to inner pressure of air cylinder p in intake process2Determine air passage outlet flow velocity c with stagnation parameter2With specific volume parameter
v2；
According to air passage outlet flow velocity c2, exit specific volume v2, critical flow velocity Ccr, critical specific volume vcrCut with air passage outlet
Area A2Determine air flue throat area A0；
Wherein AcrFor sectional area during gas critical state.
2) determine between air intake port and aditus laryngis apart from L1Method with the ratio of air intake duct length L is：
2.1) suitable expansion tip angle is determined according to the structure arrangement of cylinder capWith air intake duct length L；
2.2) according to expansion tip angleAir intake duct length L, air flue aditus laryngis equivalent diameter d0With air passage outlet equivalent diameter
d2Determine between air intake duct aditus laryngis and outlet apart from L1With the ratio of air intake duct length L, L1Computing formula be：
As shown in figure 1, the method for designing of described high pressure-charging air intake duct utilizes gas dynamics it is contemplated that intake process
The impact of middle in-cylinder pressure change.In air inlet initial stage, inner pressure of air cylinder PbLess than outlet pressure P during design2, air-flow pass through into
Air flue converging transition, aditus laryngis and divergent segment, gas constantly expands, and speed is also continuously increased.But air-flow can not be complete in air intake duct
It expand into back pressure P in cylinderb, will free wxpansion in cylinder after flowing out air intake duct.In air inlet mid-term, as inner pressure of air cylinder PbReach
Pressure P under design condition2When, air-flow increases in described air intake duct converging transition speed, and at aditus laryngis, air velocity reaches and works as
Ground velocity of sound, is further accelerated in air intake duct divergent segment air-flow, air-flow is injected with ultrasonic speed at valve retainer and started
Machine cylinder.In the air inlet later stage, inner pressure of air cylinder gradually rises, when back pressure P in cylinderbMore than outlet pressure P during design2When, according to
Gas dynamics, gas will excessively expand into state A in air intake duct, then produce shock wave in this section, and gas is dashed forward
Hit compression, gas pressure drastically raises, air-flow runs along dotted line AB；With the carrying out of intake process, A point gradually moves to 0 point
Dynamic, air-flow runs along curve 0C, so that in-cylinder pressure increases, air inflow increases.
Compared with prior art, the main distinction of the present invention is：Traditional engine inlets design is based on electromotor
The not a height of condition of admission pressure is designed.And the development with high efficiency turbocharger and engine charge pressure ratio is continuous
Improve, the degree more and more higher of plenum.For high pressure-charging even super high pressure-charging inlet air conditions, if also according to tradition
Design of Inlet method, it is poor to may result in designed air intake duct negotiability, or even can not preferably organize in cylinder
Gas.The method for designing of the present invention utilizes gas flow behavior under high boost conditions, and designed air intake duct can improve air inlet
The negotiability in road, increases air inflow, and to optimizing burning, lifting engine performance has positive role.
The positive effect of the present invention is：
When overcoming high pressure-charging technology and being applied to electromotor, the air intake duct of existing design circulates the problem of scarce capacity.Make
Obtain air intake duct to match with high pressure-charging technology, common beneficial is in the lifting of engine performance.Additionally, air intake duct negotiability
Lifting can reduce pumping loss, and meanwhile, high velocity air also allows for air inlet in tissue cylinder, burns to optimizing, improving combustion efficiency
There is positive role.
Brief description
Fig. 1 is in-cylinder pressure change schematic diagram.
Fig. 2 is a kind of high blower engine air intake duct floor map of the present invention.
Fig. 3 is a kind of high blower engine air intake duct and the method for designing scale diagrams of the present invention.
Fig. 4 is a kind of high blower engine air intake duct three dimensions schematic diagram of the present invention.
Specific embodiment
One actual design example of the present invention is described below taking the Design of Inlet of certain model highly supercharged diesel engine as a example.
Such as Fig. 2,3 it is this high blower engine air intake duct schematic diagram.Described air intake duct is including air intake duct converging transition 2 and gradually
Expand section 4, it is air intake duct aditus laryngis 3 that converging transition 2 arrives divergent segment 4 intermediate location.
It is a kind of high blower engine air intake duct and the method for designing scale diagrams of the present invention shown in Fig. 3.
1) gas temperature T at inlet mouth is determined according to supercharger performance data1For 358.15K, pressure P1For
3.5bar, gas flow rate C1For 80m/s.Air intake port design back-pressure p2It is chosen for 2.9bar.
According to cylinder arrangement, this air intake port diameter d2=33.2mm2, therefore air intake port sectional area A2For
789.436nm2；
Air is assumed to ideal gases, cpTake 1.004kJ/ (kg.K), k is 1.4, RgFor 287J/ (kg.K)；The facing of air
Boundary's pressure ratio νcrFor 0.528.
Above-mentioned value is substituted into formula (1) (2) (3) (4) and tries to achieve air flue throat area A0For 642.51mm2, therefore air intake duct larynx
Mouth sectional area A0With air intake port area A2Ratio be 0.81.
2) the expansion tip angle being determined according to the structure arrangement of cylinder capFor 6 °, air intake duct total length L is 100mm, air intake duct
Outlet diameter d2=33.2mm2；A is amassed according to air flue gullet section0=642.51mm, its equivalent diameter d0For 28.6mm, will be above-mentioned
Value substitutes into L1Computing formula (5)
Try to achieve between air intake port and aditus laryngis apart from L1For 44.14mm, therefore apart from L between air intake port and aditus laryngis1
Ratio with air intake duct total length L is 0.44.
Under described high blower engine operating mode, in air intake duct come to flow air flue porch enter converging transition 2, with
The contraction of air flue shape, at air intake duct aditus laryngis 3, air-flow reaches the velocity of sound.In divergent segment 4, air-flow constantly accelerates in air flue.?
At the air inlet initial stage, air-flow passes through valve retainer 6 with supersonic speed state, injects cylinder 8；In air inlet middle and late stage, air-flow is entering
Air flue is interior to have assault compression process, and gas pressure raises, so that the pressure rise that air inlet ends, air inflow increase.
Described air intake duct is unique air intake duct of two air valve engines, or enters for one of them of multivalve engine
Air flue.
The key of Design of Inlet of the present invention is by controlling air intake duct shape of cross section so that the gas after supercharging is in gas
Fully expanded in road, then assault compression, pressure rise, so that air inlet end of a period in-cylinder pressure raises.
Fig. 4 is the high blower engine air intake duct three dimensions schematic diagram in the embodiment of the present invention.
Invention has been described above it is clear that the present invention implements is not subject to the restrictions described above, as long as adopting
The improvement of the various unsubstantialities being carried out with method of the present invention design and technical scheme, or the not improved structure by the present invention
Think and technical scheme directly applies to other occasions, all within the scope of the present invention.
Claims (1)
1. a kind of method for designing of high blower engine air intake duct, described high blower engine air intake duct, tapered including air intake duct
Section, air intake duct aditus laryngis and air intake duct divergent segment；Described air intake duct gullet section amasss A0With air intake port sectional area A2Ratio
Between 0.75～0.85；Apart from L between described air intake duct aditus laryngis and outlet1With the ratio of air intake duct total length L 0.4～0.6 it
Between；
It is characterized in that：The method for designing of described high blower engine air intake duct comprises the following steps：
1) inlet mouth condition is determined according to supercharger pressure ratio and engine operation condition, including temperature T1, pressure P1And speed
Degree c1, determine that air intake duct gullet section amasss A0With air intake port sectional area A2The step of ratio include：
1.1) according to gaseous state parameter determination gas stagnation parameter at inlet mouth；
1.2) according to gas critical pressure ratio ν in air fluecrDetermine the critical parameters of gas with stagnation parameter；
1.3) according to inner pressure of air cylinder p in intake process2Determine air passage outlet flow velocity c with stagnation parameter2With specific volume parameter v2；
1.4) according to air passage outlet flow velocity c2, exit specific volume v2, critical flow velocity Ccr, critical specific volume vcrCut with air passage outlet
Area A2Determine air flue throat area A0；
2) determine between air intake port and aditus laryngis apart from L1Method with the ratio of air intake duct total length L is：
2.1) suitable expansion tip angle is determined according to the structure arrangement of cylinder capWith air intake duct total length L；
2.2) according to expansion tip angle, air intake duct total length L, air flue aditus laryngis equivalent diameter d0With air passage outlet equivalent diameter d2
Determine between air intake duct aditus laryngis and outlet apart from L1Ratio with air intake duct total length L.
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| CN104047780B true CN104047780B (en) | 2017-02-22 |
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| FR2788565B1 (en) * | 1999-01-15 | 2001-02-09 | Renault Vehicules Ind | INTAKE MANIFOLD COMPRISING MEANS OF CONNECTION TO AN EXHAUST GAS RECYCLING CIRCUIT |
| FR2894297B1 (en) * | 2005-12-01 | 2008-01-04 | Renault Sas | IMPROVED AIR SUPPLY DISTRIBUTOR FOR INTERNAL COMBUSTION ENGINE |
| JP2012041898A (en) * | 2010-08-20 | 2012-03-01 | Toyota Motor Corp | Engine |
| CN202125382U (en) * | 2011-05-25 | 2012-01-25 | 广西玉柴机器股份有限公司 | Gas inlet tube of diesel engine |
| CN203009117U (en) * | 2012-10-12 | 2013-06-19 | 张京州 | Automobile variable air inlet pipe with built-in LAVAL pipe provided with vortex air guide grooves and automobile provided with variable air inlet pipe |
| CN103397959A (en) * | 2013-07-02 | 2013-11-20 | 广西玉柴机器股份有限公司 | Air inlet connecting pipe of EGR engine |
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